dial in

Meanings

1. To configure or set up (particularly a complex machine with many configuration options [especially knobs and dials).
2. To connect (to a system or service) by telephone.
3. To join or participate in (a conference call).
4. To apprehend and align oneself (to an idea, circumstance, way of thinking, etc.).
5. To reduce (something) to an appropriate level.
6. To achieve a perfect result in brewing coffee by manipulating grind size, water amount, etc.

Etymology

dial + in, from tuning in to a radio frequency by changing the dial, or dialling a telephone number (originally on a rotary dial).